Ordering number : ENN8386
LA7784
Monolithic Linear IC
Downconverter IC
for Digital CATV
http://onsemi.com
Overview
The LA7784 is a downconverter IC for digital CATV. It accepts RF input frequencies from 50 to 150MHz and supports
the DOCSIS (USA) and Euro-DOCSIS (Europe) standards.
Features
• RF Mixer.
• Attenuation control for RF Mixer.
• Driver for SAW filter.
• IF AGC amplifier.
• IF Driver amplifier for ADC.
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Circuit voltages
Circuit current
Symbol
VCC max
V max
I12, 13
Allowable power dissipation
Pd max
Conditions
Ratings
Pin 8, 14, 19, 20, 21, 22, 26, 27
Pin 9
Pin 12, 13 sink current
Unit
6.0
V
VCC
V
2
Ta≤70°C
V
900*
mA
Operating temperature range
Topr
-20 to +70
mW
Storage temperature range
Tstg
-55 to +150
°C
* On the board (114.3×76.1×1.6mm)
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Recommended supply voltage
VCC
Pin 8, 14, 19, 20, 21, 22, 26, 27
5.0
V
Operating supply voltage range
VCC op
Pin 8, 14, 19, 20, 21, 22, 26, 27
4.5 to 5.5
V
Semiconductor Components Industries, LLC, 2013
July, 2013
92706 / O2505 MS OT B8-6337 No.8386-1/7
LA7784
AC Characteristics at Ta = 25°C, VCC = 3.3V
Parameter
Symbol
Pin No.
Ratings
Conditions
min
typ
Circuit current
Itotal
8, 14, 19, 20, 21, 22, 26, 27
No Signal
80
RF input frequency range
f(RF)
23, 24
fc:-3dB
50
Unit
max
105
RF AGC range
GR1
26, 27
V9 = 2.5 to 0V
45
53
Mixer conversion gain
CG1
26/23, 24
V9 = 2.5V
19
22
Mixer inter modulation 1
IM3 1
40
50
130
mA
150
MHz
25
dB
dB
27/23, 24
IF input frequency range
IF amplifier gain
f(IF)
G(AGC)
26/23, 24
Input = 75dBμ
27/23, 24
V9 = 2.5V
4, 5
fc:-3dB
30
12/4, 5
V9 = 2.5V
51
55
Output = 110dBμ
40
50
dB
100
MHz
59
dB
13/4, 5
IF inter modulation 2
IM3 2
12/4, 5
dB
13/4, 5
Range
12, 13
IF Output Level < ±1dB
IF AGC output level
Vo(IF) 1
GR2
12
Single output
3
1.0
5
Vp-p
dB
IF output level
Vo(IF) 2
13
Single output
1.0
Vp-p
Package Dimensions
unit: mm
3222A
No. 8386-2/7
LA7784
Pin Assignment
NC
1
28
DRIVER GND
NC
2
27
DRIVER OUTPUT
IF AGC AMP GND
3
26
DRIVER OUTPUT
IF AGC AMP INPUT
4
25
RF ATT GND
IF AGC AMP INPUT
5
24
RF ATT INPUT
NC
6
23
RF ATT INPUT
IF AGC AMP GND
7
22
RF ATT VCC
GND
GND
IF AGC AMP VCC
8
21
LNA VCC
AGC CONTROL
9
20
DRIVER VCC
NC
10
19
MIXER/LO VCC
IF DRIVER AMP GND
11
18
NC
IF DRIVER AMP OUTPUT
12
17
LO INPUT
IF DRIVER AMP OUTPUT
13
16
LO INPUT
IF DRIVER AMP VCC
14
15
MIXER/LO GND
Block Diagram
No. 8386-3/7
LA7784
Pin Description
Pin Number
(unit: Ω)
Description
1
No Connection
2
No Connection
3
AGC Amp GND
4
AGC Amp Input
Equivalent circuit
5
6
No Connection
7
AGC Amp GND
8
AGC Amp VCC
9
AGC Control
10
No Connection
11
Post Amp GND
Continued on next page.
No. 8386-4/7
LA7784
(unit: Ω)
Continued from preceding page.
Pin Number
12
Description
Equivalent circuit
Post Amp Outputs
13
14
Post Amp VCC
15
Mixer/LO GND
16
LO Input
17
18
No Connection
19
Mixer/LO VCC
20
Driver VCC
Continued on next page.
No. 8386-5/7
LA7784
(unit: Ω)
Continued from preceding page.
Pin Number
21
Description
Equivalent circuit
LNA VCC
22
23
LNA Inputs
24
25
LNA GND
26
Driver Outputs
27
28
Driver Gnd
No. 8386-6/7
LA7784
Test Circuit
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PS No.8386-7/7